No network container-to-container (with docker)

Hello.
I’m starting to learn to use LXD.
I’m using Manjaro Linux, and I have docker installed in this host.

So, installed LXD, init all default, and create my first two containers.

I fixed the ip for the containers.

After fixing the issue with docker and lxd networking (found a iptables command to fix it in a forum), now I’m able to reach the internet from inside the containters.

I can ping from both containers to the bridge, and to any ip address or name BUT I can’t ping one container from the other, and viceversa

So, what am I doing wrong? What info do you need to help me?

EDIT: I tested it in a Open SUSE installation and it works (no docker in the host), but I really need it fixed in my main computer
EDIT: the definition for my bridge

{
  "config": {
    "ipv4.address": "192.168.5.1/24",
    "ipv4.nat": "true",
    "ipv6.address": "none"
  },
  "description": "",
  "name": "lxdbr0",
  "type": "bridge",
  "used_by": [
    "/1.0/profiles/default",
    "/1.0/instances/t1",
    "/1.0/instances/t2"
  ],
  "managed": true,
  "status": "Created",
  "locations": [
    "none"
  ]
}

My iptables --list

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy DROP)
target     prot opt source               destination
DOCKER-USER  all  --  anywhere             anywhere
DOCKER-ISOLATION-STAGE-1  all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
DOCKER     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain DOCKER (2 references)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             172.17.0.2           tcp dpt:cslistener
ACCEPT     tcp  --  anywhere             172.18.0.11          tcp dpt:8125
ACCEPT     tcp  --  anywhere             172.18.0.11          tcp dpt:8094
ACCEPT     tcp  --  anywhere             172.18.0.11          tcp dpt:8092
ACCEPT     tcp  --  anywhere             172.18.0.26          tcp dpt:hbci
ACCEPT     tcp  --  anywhere             172.18.0.27          tcp dpt:d-s-n
ACCEPT     tcp  --  anywhere             172.18.0.29          tcp dpt:irdmi
ACCEPT     tcp  --  anywhere             172.18.0.2           tcp dpt:postgresql
ACCEPT     tcp  --  anywhere             172.18.0.4           tcp dpt:22300
ACCEPT     tcp  --  anywhere             172.18.0.5           tcp dpt:us-srv
ACCEPT     tcp  --  anywhere             172.18.0.6           tcp dpt:arepa-cas
ACCEPT     tcp  --  anywhere             172.18.0.13          tcp dpt:http
ACCEPT     tcp  --  anywhere             172.18.0.15          tcp dpt:http
ACCEPT     tcp  --  anywhere             172.18.0.16          tcp dpt:http
ACCEPT     tcp  --  anywhere             172.18.0.17          tcp dpt:commplex-main
ACCEPT     tcp  --  anywhere             172.18.0.16          tcp dpt:https
ACCEPT     tcp  --  anywhere             172.18.0.20          tcp dpt:trivnet1
ACCEPT     tcp  --  anywhere             172.18.0.3           tcp dpt:ssh
ACCEPT     tcp  --  anywhere             172.18.0.7           tcp dpt:sunproxyadmin
ACCEPT     tcp  --  anywhere             172.18.0.7           tcp dpt:http-alt
ACCEPT     tcp  --  anywhere             172.18.0.9           tcp dpt:8920
ACCEPT     tcp  --  anywhere             172.18.0.9           tcp dpt:8096
ACCEPT     tcp  --  anywhere             172.18.0.12          tcp dpt:https

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target     prot opt source               destination
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere
DOCKER-ISOLATION-STAGE-2  all  --  anywhere             anywhere
RETURN     all  --  anywhere             anywhere

Chain DOCKER-ISOLATION-STAGE-2 (2 references)
target     prot opt source               destination
DROP       all  --  anywhere             anywhere
DROP       all  --  anywhere             anywhere
RETURN     all  --  anywhere             anywhere

Chain DOCKER-USER (1 references)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
RETURN     all  --  anywhere             anywhere

and lxc list

+------+---------+----------------------+------+-----------+-----------+
| NAME |  STATE  |         IPV4         | IPV6 |   TYPE    | SNAPSHOTS |
+------+---------+----------------------+------+-----------+-----------+
| t1   | RUNNING | 192.168.5.101 (eth0) |      | CONTAINER | 0         |
+------+---------+----------------------+------+-----------+-----------+
| t2   | RUNNING | 192.168.5.102 (eth0) |      | CONTAINER | 0         |
+------+---------+----------------------+------+-----------+-----------+

I fixed it removing docker from host. The only way.